Sage is used to being the fastest runner, the quickest climber, and the strongest swimmer around. And shes also used to taking charge. But when the second race course has the red team diving underwater to explore the Great Barrier Reef, its trusting her teammates that matters most. Its sink or swim time... . Each chapter in this action-packed adventure series is bursting with totally true facts about wild and wonderful creatures, dangerous habitats, maps, and more!